EP 1035425 A4 20051228 - FIBER GRATING, ITS MANUFACTURING METHOD AND ITS MANUFACTURING DEVICE
Title (en)
FIBER GRATING, ITS MANUFACTURING METHOD AND ITS MANUFACTURING DEVICE
Title (de)
FASERGITTER, DESSEN HERSTELLUNGSVERFAHREN DESSEN HERSTELLUNGSVORRICHTUNG
Title (fr)
RESEAU DE FIBRES, SON PROCEDE ET SON DISPOSITIF DE FABRICATION
Publication
Application
Priority
- JP 9805311 W 19981125
- JP 32416797 A 19971126
- JP 11225998 A 19980422
- JP 20307798 A 19980717
Abstract (en)
[origin: EP1035425A1] A core 2 is co-doped with Ge in a general concentration equivalent to that in a core of an optical fiber to be connected as well as Sn and Al in predetermined concentrations. A glass part F including the core and a cladding 3 is coated with a primary coat layer 4 of a UV transmitting resin which transmits UV of 240 nm through 270 nm but cures by absorbing UV of a shorter wavelength band than 240 nm or a longer wavelength band than 270 nm. A grating is written in the core by irradiating the core with UV through the primary coat layer. The primary coat layer is covered with a secondary coat layer 7 of a resin having a negative coefficient of linear expansion so as to cancel and suppress expansion/shrinkage of the glass part in accordance with temperature change derived from the positive coefficient of linear expansion. Thus, the invention provides a fiber grating and a method of fabricating a fiber grating, in which a grating can be easily written without causing degradation of the transmitting characteristic, the transmitting characteristic and the mechanical strength characteristic can be consistent with each other without spoiling improvement of productivity, and the temperature characteristic can be stabilized for attaining high reliability. <IMAGE>
IPC 1-7
IPC 8 full level
G02B 6/02 (2006.01)
CPC (source: EP US)
G02B 6/02138 (2013.01 - EP US); G02B 2006/02161 (2013.01 - EP US)
Citation (search report)
- [AX] EP 0762158 A1 19970312 - AT & T CORP [US]
- [X] GB 2295689 A 19960605 - NORTHERN TELECOM LTD [CA]
- [X] US 5216739 A 19930601 - HILL KENNETH O [CA], et al
- [X] WO 9115787 A1 19911017 - BRITISH TELECOMM [GB]
- See also references of WO 9927399A1
Designated contracting state (EPC)
FR GB
DOCDB simple family (publication)
EP 1035425 A1 20000913; EP 1035425 A4 20051228; CA 2311725 A1 19990603; US 6751380 B1 20040615; WO 9927399 A1 19990603
DOCDB simple family (application)
EP 98955930 A 19981125; CA 2311725 A 19981125; JP 9805311 W 19981125; US 55459900 A 20000526